Impedance analysis of piezoelectric energy harvesting system using synchronized charge extraction interface circuit

Chen Chen; Kang Zhao; Junrui Liang

doi:10.1117/12.2261095

11 April 2017 Impedance analysis of piezoelectric energy harvesting system using synchronized charge extraction interface circuit

Chen Chen, Kang Zhao, Junrui Liang

Author Affiliations +

Proceedings Volume 10164, Active and Passive Smart Structures and Integrated Systems 2017; 101642Q (2017) https://doi.org/10.1117/12.2261095
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2017, Portland, Oregon, United States

Abstract

The synchronous charge extraction (SCE) interface circuit is unique among the existing piezoelectric energy har- vesting (PEH) power conditioning circuits, for its output power is independent of the load. The previous studies about SCE have assumed lossless rectifier and ideal energy transfer through the inductor; the detailed energy flow picture in SCE was absent. This paper provides an impedance based analysis for the PEH system using SCE interface circuit. Through qualitative analysis on the energy cycle, the electrically induced dynamics of SCE is broken down into three components: the accompanied capacitance, dissipative resistance, and harvesting resis- tance, which correspond to an additional stiffness, a dissipative damper, and a regenerative damper, respectively, to the mechanical structure. Quantitative analysis on the harvested power is also carried out. Experiments on practical PEH system show good agreement with the theoretical results. The new insight provided in this study help better understand the dynamics and better evaluate the harvesting capability of the SCE circuit among those options of power conditioning towards practical PEH implementations.

Citation Download Citation

Chen Chen, Kang Zhao, and Junrui Liang "Impedance analysis of piezoelectric energy harvesting system using synchronized charge extraction interface circuit", Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101642Q (11 April 2017); https://doi.org/10.1117/12.2261095

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